I have one confusion when in question we knw tht speed is getting reduced so should we put the sign of acceleration negative?? For ex in this question:-A car moving in a straight line at 30 m/s slows uniformly toa speed of 10 m/s in 5 sec. Determine:(a)the acceleration of the car,(b)displacement in the third second.When I take the sign of “a” negative the magnitude of a is coming out be positive and when I put the value of “a”(+ve) in b part i get wrong answer of b part

Mohammad Kavish , 9 Years ago

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